由多个指标分析

Question

的我有这个SQL连接：

SELECT 
    artists.id, 
    actors.id, 
    actors.count 
FROM 
    artists 
INNER JOIN actors ON artists.title = actors.title; 

演员表都得到了重复和一些counter领域。所以不可能有

Tom Waits | 10 
Tom Waits | 30 

我怎样才能改变我的第一个SQL所以它会返回只有那些演员，谁已经得到MAX(count)

喜欢的东西

SELECT 
    artists.id, 
    actors.id, 
    actors.count 
FROM 
    artists 
INNER JOIN actors ON artists.title = actors.title 
HAVING MAX(actors.count); 

Answer 1

如何

SELECT actors.id 
     , MAX(actors.count) 
FROM artists 
     INNER JOIN actors ON artists.title = actors.title 
GROUP BY 
     actors.id   

Answer 2

SELECT 
    artists.id, 
    actors.id, 
    MAX(actors.count) 
FROM 
    artists 
INNER JOIN actors ON artists.title = actors.title; 
GROUP BY 
    actors.id 

Answer 3

Try t他的一个 -

SELECT artists.id, actors.id, actors.`count` FROM artists 
    INNER JOIN actors 
    ON artists.title = actors.title 
    INNER JOIN (
    SELECT title, MAX(`count`) max_count FROM actors 
     GROUP BY title 
    ) actors2 
    ON actors.title = actors2.title AND actors.`count` = actors2.max_count; 

Answer 4

SELECT artists.id, a.id, a.count 
FROM artists 
INNER JOIN (SELECT actors.id, actors.count 
      FROM actors 
      HAVING MAX(actors.count)) a ON artists.title = a.title 

Answer 5

最简单的办法：

SELECT 
    artists.id, 
    (select actors.id 
    from actors 
    where artists.title = actors.title 
    order by actors.count desc Limit 1) 
    as actors_id, 
    (select actors.count 
    from actors 
    where artists.title = actors.title 
    order by actors.count desc Limit 1) 
    as actors.count 
FROM 
    artists 
;